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Root exudation of contrasting drought-stressed pearl millet genotypes conveys varying biological nitrification inhibition (BNI) activity

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Relation http://oar.icrisat.org/11888/
https://doi.org/10.1007/s00374-021-01578-w
doi:10.1007/s00374-021-01578-w
 
Title Root exudation of contrasting drought-stressed pearl millet genotypes conveys varying biological nitrification inhibition (BNI) activity
 
Creator Ghatak, A
Schindler, F
Bachmann, G
Engelmeier, D
Bajaj, P
Brenner, M
Fragner, L
Varshney, R K
Subbarao, G V
Chaturvedi, P
Weckwerth, W
 
Subject Pearl Millet
Genetics and Genomics
 
Description Roots secrete a vast array of low molecular weight compounds into the soil broadly referred to as root exudates. It is a key
mechanism by which plants and soil microbes interact in the rhizosphere. The effect of drought stress on the exudation process
and composition is rarely studied, especially in cereal crops. This study focuses on comparative metabolic profiling of
the exudates from sensitive and tolerant genotypes of pearl millet after a period of drought stress. We employed a combined
platform of gas and liquid chromatography coupled to mass spectrometry to cover both primary and secondary metabolites.
The results obtained demonstrate that both genotype and drought stress have a significant impact on the concentration and
composition of root exudates. The complexity and function of these differential root exudates are discussed. To reveal the
potential effect of root exudates on the soil microbial community after a period of drought stress, we also tested for biological
nitrification inhibition (BNI) activity. The analysis revealed a genotype-dependent enhancement of BNI activity after
a defined period of drought stress. In parallel, we observed a genotype-specific relation of elongated root growth and root
exudation under drought stress. These data suggest that the drought stress-dependent change in root exudation can manipulate
the microbial soil communities to adapt and survive under harsh conditions.
 
Publisher Springer
 
Date 2021-06
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://oar.icrisat.org/11888/1/s00374-021-01578-w.pdf
Ghatak, A and Schindler, F and Bachmann, G and Engelmeier, D and Bajaj, P and Brenner, M and Fragner, L and Varshney, R K and Subbarao, G V and Chaturvedi, P and Weckwerth, W (2021) Root exudation of contrasting drought-stressed pearl millet genotypes conveys varying biological nitrification inhibition (BNI) activity. Biology and Fertility of Soils (TSI). ISSN 0178-2762